Qt4 TreeView - Items Filtering

In a few words, I've a QTreeView that displays folder items. I Need to filter items, showing empty folders.

QSortFilterProxyModel: For hierarchical models, the filter is applied recursively to all children. If a parent item doesn't match the filter, none of its children will be shown.

Using QSortFilterProxyModel the result is that the filter is applied on the foldes, so we've something like a root only filter. The solution is simple.. Inherits QSortFilterProxyModel and...

class QfTreeProxyModel : public QSortFilterProxyModel {
  public:
    QfTreeProxyModel (QObject *parent = 0)
      : QSortFilterProxyModel(parent)
   {
      setFilterCaseSensitivity(Qt::CaseInsensitive);
   }

  protected:
    bool filterAcceptsRow(int source_row, const QModelIndex& source_parent) const
    {
      QModelIndex idx = sourceModel()->index(source_row, 0, source_parent);
      if (sourceModel()->hasChildren(idx))
         return(true);
      return(QSortFilterProxyModel::filterAcceptsRow(source_row, source_parent));
    }
};

Here you can find the example source code: http://th30z.netsons.org/wp-content/uploads/qfilteredtreeview.cpp